CN102635327A - Grouting method and system of cracked coal rock mass - Google Patents
Grouting method and system of cracked coal rock mass Download PDFInfo
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- CN102635327A CN102635327A CN2012100969764A CN201210096976A CN102635327A CN 102635327 A CN102635327 A CN 102635327A CN 2012100969764 A CN2012100969764 A CN 2012100969764A CN 201210096976 A CN201210096976 A CN 201210096976A CN 102635327 A CN102635327 A CN 102635327A
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Abstract
The invention relates to the technical field of coal mine exploitation and discloses a grouting method and system of cracked coal rock mass. The grouting procedure is performed on the cracked coal rock mass of a back production gateway in front of a back production face, and the grouting method comprises the following steps: step 1. drilling a deep hole in the cracked coal rock mass by using a drill bit; step 2. inserting a hole packer connected with a slurry injection pipe and a grouting pipe in the deep hole, wherein the slurry injection pipe is connected with the front end of the hole packer, the grouting pipe is connected with the tail end of the hole packer, and the other end of the grouting pipe is connected with a chemical grouting machine; and step 3. sealing the hole and grouting section by section according to the depth of the deep hole, starting the chemical grouting machine to pressurize the hole packer to seal the hole, wherein a blocking piece is pushed away when a pressure value under which the blocking piece can be pushed away is reached, and then the slurry injection pipe grouts the deep hole. According to the invention, a hole is drilled in the cracked coal rock mass of the back production gateway in front of the back production face and grouting is performed section by section,the technique is simple, the low is low and the operation at the coal mining face is not affected.
Description
Technical field
The present invention relates to the coal mining technical field, particularly relate to a kind of fractured coal and rock grouting method and system.
Background technology
In process of coal mining, often run into geological structures such as tomography, fold and cranny development band, large tracts of land roof fall, wall caving and gushing water accident very easily appear in the coal and rock loose crushing, and the serious threat coal mine downhole safety is produced.It is the effective way that addresses the above problem that fractured coal and rock is implemented grouting and reinforcing.Can be divided into two big types according to injecting paste material: cement injection and chemical grouting.Cement class injecting paste material is not suitable for coal and rock and reinforces fast owing to growing hardening time, can not injecting tiny shortcomings such as crack.Chemical slip casting material belongs to high-molecular organic material; Comprise polyurethane, epoxy resin, Lauxite etc.; Mainly pour in the coal and rock crack through pressure or chemosmosis, can be fixed in the short period of time and reach higher intensity, make that the loose crushing country rock is glued to become non-individual body.Chemical slip casting material has excellent performances such as viscosity is low, good penetrability, gain in strength is fast, adhesion strength is high, deformability is good, in engineering fields such as colliery, tunnel, water conservancy and hydropower, railway, municipal administration, obtains using more widely.
At present, the grouting mode that leading reinforcing is taked to the coal-face fractured coal and rock all is shallow bore hole slip casting.General drilling depth is at 2m-5m, in coal-face slip casting, with annotating with adopting.Not only can not fundamentally separate the potential safety hazard that structural belts such as phantom, fold and cranny development band bring, and influence the ordinary production of coal-face, reduce Coal Production efficient.
Summary of the invention
The technical problem that (one) will solve
The technical problem that the present invention will solve is fractured coal and rock grouting method and the system that how to provide that a kind of technology is simple, cost is lower and can not influence the coal-face operation.
(2) technical scheme
In order to solve the problems of the technologies described above, the present invention provides a kind of fractured coal and rock grouting method and system, on the fractured coal and rock of the back production crossheading in stope the place ahead, carries out slip casting, and its grouting method comprises:
Step 1, employing drill bit are holed on said fractured coal and rock, and are got out a deep hole;
Step 3, carry out sealing of hole and slip casting according to the degree of depth segmentation of said deep hole: open the chemical grouting machine to the hole packer sealing of hole that pressurizes, jam is open when reaching the design pressure that promotes jam, and Grout-jetting pipe carries out slip casting to said deep hole.
Wherein, the two ends of said Grouting Pipe adopt screw thread to be connected with the chemical grouting machine with hole packer respectively.
Wherein, said chemical grouting machine comprises two kinds of slurries, and said two kinds of slurries inject through the fluid injection threeway and inject hole packer through Grouting Pipe after static mixer mixes.
Wherein, the degree of depth of said deep hole is 15～40m.
Wherein, the grouting pump of said chemical grouting machine provides power by blast.
The present invention also provides a kind of fractured coal and rock filling system, comprises deep hole, hole packer and chemical grouting machine; Said deep hole is positioned on the fractured coal and rock of back production crossheading in stope the place ahead, and its opening down; The front end of said hole packer is connected with Grout-jetting pipe; Its end is connected with Grouting Pipe; Said hole packer is positioned at said deep hole, is used for sealing of hole, and said Grout-jetting pipe is used for slip casting is carried out in boring; The other end of said Grouting Pipe is connected with the chemical grouting machine, and said chemical grouting machine is used to provide slurries hole packer is pressurizeed and slip casting.
Wherein, Said hole packer comprises adapter sleeve, jam, core pipe, packing element and valve seat, and said adapter sleeve and valve seat lay respectively at the two ends of said core pipe, and said adapter sleeve is connected with said Grout-jetting pipe; Said valve seat is connected with said Grouting Pipe; Said jam is withheld the junction that ring is installed in adapter sleeve and core pipe through first, and said packing element is in the outside of said core pipe, and the tube wall of said core pipe is provided with fluid hole.
Wherein, Said chemical grouting machine comprises grouting pump, slip casting bucket, fluid injection threeway and static mixer, and said grouting pump is connected with the slip casting bucket, and said slip casting bucket comprises two slip casting stavings; A kind of slurries of difference splendid attire in each slip casting staving; Said two slip casting stavings are connected with the fluid injection threeway through discharging tube respectively, and another outlet of said fluid injection threeway is connected with static mixer, and said static mixer is connected with Grouting Pipe through high-pressure rubber pipe.
Wherein, the two ends of said Grouting Pipe adopt screw thread to be connected with the chemical grouting machine with hole packer respectively.
Wherein, said grouting pump provides power by blast.
(3) beneficial effect
A kind of fractured coal and rock grouting method and system that technique scheme provides hole on the fractured coal and rock of the back production crossheading in stope the place ahead, and adopt segmenting slip casting, and technology is simple, and cost is lower, and can not influence the coal-face operation; Further; The two ends of Grouting Pipe are adopted screw thread and hole packer and chemical grouting machine respectively; Follow-up Grouting Pipe comes off in the time of can avoiding Grouting Pipe to separate with hole packer, and the terminal Grouting Pipe of hole packer is extracted the slip casting operation of next section is not impacted smoothly.
Description of drawings
Fig. 1 is the structural representation of fractured coal and rock filling system of the present invention;
Fig. 2 is the structural representation of hole packer of the present invention;
Fig. 3 is a fundamental diagram of the present invention.
Wherein, 1, fractured coal and rock; 2, deep hole; 3, hole packer; 3a, adapter sleeve; 3b, jam; 3d, core pipe; 3e, packing element; 3f, valve seat; 3g, first withholds ring; 3h, fluid hole; 3i, second withholds ring; 3j, spring; 3k, steel ball; 4, Grout-jetting pipe; 5, Grouting Pipe; 6a, grouting pump; 6b, slip casting bucket; 6c, fluid injection threeway; 6d, static mixer; 6e, discharging tube; 6f, high-pressure rubber pipe; 7, wind-pressure tube.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail.Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
Like Fig. 1 and Fig. 2, a kind of fractured coal and rock grouting method of the present invention carries out slip casting on the fractured coal and rock of the back production crossheading in stope the place ahead, and its grouting method comprises:
Step 1, employing drill bit are holed on fractured coal and rock 1, and are got out a deep hole 2; Be specially: rig is laid in the nearest relatively place of chosen distance fault belt in the back production crossheading; Rig is connected with drill bit, owing to need the degree of depth of boring long, generally uses geological drilling rig to be equipped with ￠ 93 and bores; The direction of boring, inclination angle, height are decided according to the concrete condition of fractured coal and rock; Boring direction will with fault belt oblique or quadrature, reduce the length of boring as far as possible, be upward through zone of fracture 1m～2m such as tomography up to inclination, the degree of depth of boring is generally 15～40m;
Step 3, carry out sealing of hole and slip casting according to the degree of depth segmentation of deep hole 2: open the chemical grouting machine to hole packer 3 sealing of hole that pressurizes, jam 3b is open when reaching the design pressure that promotes jam 3b, and 4 pairs of deep holes of Grout-jetting pipe 2 carry out slip casting; Be specially: the length of confirming each slip casting section according to maximum pressure and the cranny development situation of grouting pump 6a, general slip casting segment length are connected Grout-jetting pipe 4 and hole packer 3 piecemeal and send into deep hole 2 between 8m～15m; Be connected with the chemical grouting machine through Grouting Pipe 5 then and carry out sealing of hole and slip casting; When slurries progress into pipeline, pressure raises, and hole packer 3 deforms and expands and the boring wall is fitted closely; Slurries will break through jam; Get into boring along Grout-jetting pipe 4 and be diffused into the fractured coal and rock crack, when treating that grouting pressure is elevated to design pressure, stop grouting pump 6a, open the pipeline relief valve, the terminal Grouting Pipe 5 of dismounting hole packer.
Can disposable hole packer 3 be separated with Grouting Pipe 5 in the process of dismounting and can not cause that the follow-up Grouting Pipe that is connected comes off in boring in order to make; The terminal Grouting Pipe of hole packer is extracted the slip casting operation of next section is not impacted smoothly; The two ends of Grouting Pipe 5 adopt screw thread to be connected with the chemical grouting machine with hole packer 3 respectively, are the left-hand thread form at the terminal adapter sleeve 3a that is adopted of hole packer simultaneously.
In order to guarantee the ability to cure of slurry, the chemical grouting machine of present embodiment comprises two kinds of slurries, and these two kinds of slurries inject through fluid injection threeway 6c and inject hole packer through Grouting Pipe after static mixer 6d mixes.This static mixer 6d comprises and mixes the body helical form core pipe inner with being installed in this mixings body, guarantee slurries through the time can well mix the consolidation effect that reaches desirable, this mixing body is diameter 6 minutes, the seamless steel pipe of 100mm length.
Like Fig. 3, the detailed process that sealing of hole and slip casting are carried out in the segmentation in the above-mentioned steps 3 is:
Phase I: in stope, run under structure such as tomography, the fold zone of fracture situation, at the fractured coal and rock 1 of the back production crossheading in coal-face the place ahead 2～3 the slip casting deep holes of a row that are arranged in parallel, the degree of depth is 15m～20m; Use hole packer 3 to carry out sealing of hole, segmenting slip casting, first section hole sealing depth are 8m～10 meter, and hole packer 3 connects the Grout-jetting pipe 4 of 7m～8m, and Grout-jetting pipe 4 is offered at a distance from 0.3m and penetrated the slurry hole so that slurries can be diffused in the fractured coal and rock around the boring, and the aperture is ф 3mm; Second section sealing of hole carries out sealing of hole and slip casting at two meters of hell;
In driving face, run under the structure zone of fracture situation such as tomography, fold; After finishing, phase I slip casting can carry out normal tunneling construction; When tunneling to foot of hole the place ahead 1m～2m place, stop to tunnel the slip casting of carrying out next circulation, through two slip castings circulations and driving; Grope slurry infiltration rule and range of scatter gradually, can strengthen the degree of depth of injected hole so that back production crossheading driving can normalization;
Second stage: the injected hole degree of depth is enlarged to 30m～40m; Segmenting slip casting carries out first section slip casting, and the hole packer plug is arrived from aperture 15m～20m place; Hole packer connects 14m～19m rice Grout-jetting pipe; Grout-jetting pipe at a distance from 0.5m offer penetrate the slurry hole so that slurries can be diffused into boring around fractured coal and rock in, aperture ф 3mm, for making the slip casting effect that reaches good suitably improve grouting pressure so that slurries can be good at the infiltration; Second section injection hole sealing carries out sealing of hole and slip casting to the 2m place from hell.
Like Fig. 1, a kind of fractured coal and rock filling system of the present invention comprises deep hole 2, hole packer 3 and chemical grouting machine; Deep hole 2 is positioned on the fractured coal and rock 1 of back production crossheading in stope the place ahead, and its opening down; The front end of hole packer 3 is connected with Grout-jetting pipe 4, and its end is connected with Grouting Pipe 5, and hole packer 3 is positioned at deep hole 2; Be used for sealing of hole; Grout-jetting pipe 4 is used for deep hole 2 is carried out slip casting, and the other end of Grouting Pipe 5 is connected with the chemical grouting machine, and the chemical grouting machine is used to provide slurries so that hole packer 3 is pressurizeed.This system architecture is simple, and cost is lower, can realize disposable sealing of hole of fractured coal and rock and slip casting, does not cut and can the operation of stope be impacted.
Preferably; The chemical grouting machine comprises grouting pump 6a, slip casting bucket 6b, fluid injection threeway 6c and static mixer 6d, and grouting pump 6a is connected with slip casting bucket 6b, and slip casting bucket 6b comprises two slip casting stavings; A kind of slurries of difference splendid attire in each slip casting staving; Two slip casting stavings are connected with fluid injection threeway 6c through discharging tube 6e respectively, and another outlet of fluid injection threeway 6c is connected with static mixer 6d, and this static mixer 6d is connected with Grouting Pipe 5 through high-pressure rubber pipe 6f.Preferably, grouting pump 6a is connected with wind-pressure tube 7, by blast power is provided, to guarantee the safety work in the colliery.
Preferably, as shown in Figure 2, the hole packer 3 of present embodiment comprises adapter sleeve 3a, jam 3b, core pipe 3d, packing element 3e and valve seat 3f; Adapter sleeve 3a and valve seat 3f lay respectively at the two ends of core pipe 3d; Adapter sleeve 3a is connected with Grout-jetting pipe 4, and valve seat 3f is connected with Grouting Pipe 5, and jam 3b withholds the junction that ring 3g is installed in adapter sleeve 3a and core pipe 3d through first; Packing element 3e is positioned at the outside of core pipe 3d, and the tube wall of core pipe 3d is provided with fluid hole 3h; Slurries flow into the space between core pipe 3d and the packing element 3e through this fluid hole 3h; Under the pressurization of grouting pump 6a; Slurries are full of the space between core pipe 3d and the packing element 3e; Cause sebific duct 3e expansion to fit tightly, make the sebific duct 3e external surface and the frictional force of boring 1 inwall increase, realized the purpose of sealing of hole with deep hole 2; Along with grouting pump 6a raises to hole packer 3 applied pressures; When pressure surpasses the force value of setting, when being generally 3Mpa, slurries will be washed the jam 3b of hole packer 3 front ends open; Make slurries get into deep hole 2 and also solidify with fractured coal and rock 1 gradually, realized disposable sealing of hole slip casting along Grout-jetting pipe 4.Packing element 3e withholds ring 3i through second and core pipe 3d fixes.For slurries are not flow backwards, between core pipe 3d and valve seat 3f, be provided with spring 3j and steel ball 3k successively.
Can disposable hole packer 3 be separated with Grouting Pipe 5 in the process of dismounting and can not cause that the follow-up Grouting Pipe that is connected comes off in boring in order to make; The terminal Grouting Pipe of hole packer is extracted the slip casting operation of next section is not impacted smoothly; The two ends of Grouting Pipe 5 of the present invention adopt screw thread to be connected with the chemical grouting machine with hole packer 3 respectively; Be the left-hand thread form at the terminal adapter sleeve 3a that is adopted of hole packer simultaneously; Grouting Pipe 5 is processed by 6 fens seamless steel pipes, can process 1m～2m length.Grout-jetting pipe 4 is that 6 fens pvc pipes of 3mm are processed by wall thickness generally, cuts into the long segmentation of 1m-2m as required, and the Grout-jetting pipe length of inserting boring determines according to starching segment length, is reduced 1m and confirms according to starching segment length basically.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from know-why of the present invention; Can also make some improvement and replacement, these improvement and replacement also should be regarded as protection scope of the present invention.
Claims (10)
1. a fractured coal and rock grouting method is characterized in that, on the fractured coal and rock of the back production crossheading in stope the place ahead, carries out slip casting, and its grouting method comprises:
Step 1, employing drill bit are holed on said fractured coal and rock, and are got out a deep hole;
Step 2, in said deep hole, insert the hole packer be connected with Grout-jetting pipe and Grouting Pipe, said Grout-jetting pipe is connected the front end of said hole packer, and said Grouting Pipe is connected the end of said hole packer, and the other end of Grouting Pipe is connected with the chemical grouting machine;
Step 3, carry out sealing of hole and slip casting according to the degree of depth segmentation of said deep hole: open the chemical grouting machine to the hole packer sealing of hole that pressurizes, jam is open when reaching the design pressure that promotes jam, and Grout-jetting pipe carries out slip casting to said deep hole.
2. fractured coal and rock grouting method as claimed in claim 1 is characterized in that, the two ends of said Grouting Pipe adopt screw thread to be connected with the chemical grouting machine with hole packer respectively.
3. fractured coal and rock grouting method as claimed in claim 1 is characterized in that, said chemical grouting machine comprises two kinds of slurries, and said two kinds of slurries inject through the fluid injection threeway and inject hole packer through Grouting Pipe after static mixer mixes.
4. fractured coal and rock grouting method as claimed in claim 1 is characterized in that, the degree of depth of said deep hole is 15～40m.
5. fractured coal and rock grouting method as claimed in claim 1 is characterized in that the grouting pump of said chemical grouting machine provides power by blast.
6. a fractured coal and rock filling system is characterized in that, comprises deep hole, hole packer and chemical grouting machine; Said deep hole is positioned on the fractured coal and rock of back production crossheading in stope the place ahead, and its opening down; The front end of said hole packer is connected with Grout-jetting pipe; Its end is connected with Grouting Pipe; Said hole packer is positioned at said deep hole, is used for sealing of hole, and said Grout-jetting pipe is used for slip casting is carried out in boring; The other end of said Grouting Pipe is connected with the chemical grouting machine, and said chemical grouting machine is used to provide slurries hole packer is pressurizeed and slip casting.
7. fractured coal and rock filling system as claimed in claim 6 is characterized in that, said hole packer comprises adapter sleeve, jam, core pipe, packing element and valve seat; Said adapter sleeve and valve seat lay respectively at the two ends of said core pipe; Said adapter sleeve is connected with said Grout-jetting pipe, and said valve seat is connected with said Grouting Pipe, and said jam is withheld the junction that ring is installed in adapter sleeve and core pipe through first; Said packing element is in the outside of said core pipe, and the tube wall of said core pipe is provided with fluid hole.
8. fractured coal and rock filling system as claimed in claim 6; It is characterized in that; Said chemical grouting machine comprises grouting pump, slip casting bucket, fluid injection threeway and static mixer, and said grouting pump is connected with the slip casting bucket, and said slip casting bucket comprises two slip casting stavings; A kind of slurries of difference splendid attire in each slip casting staving; Said two slip casting stavings are connected with the fluid injection threeway through discharging tube respectively, and another outlet of said fluid injection threeway is connected with static mixer, and said static mixer is connected with Grouting Pipe through high-pressure rubber pipe.
9. fractured coal and rock filling system as claimed in claim 6 is characterized in that, it is characterized in that, the two ends of said Grouting Pipe adopt screw thread to be connected with the chemical grouting machine with hole packer respectively.
10. fractured coal and rock filling system as claimed in claim 8 is characterized in that said grouting pump provides power by blast.
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| CN201210096976.4A CN102635327B (en) | 2012-04-01 | 2012-04-01 | Grouting method and system of cracked coal rock mass |
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| CN201210096976.4A CN102635327B (en) | 2012-04-01 | 2012-04-01 | Grouting method and system of cracked coal rock mass |
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| CN102852532A (en) * | 2012-10-09 | 2013-01-02 | 冀中能源股份有限公司东庞矿 | Grouting method for preventing rib walk caving |
| CN103293023A (en) * | 2013-06-18 | 2013-09-11 | 南京大学 | Original state sampling method for constructed fractured rock mass |
| CN103835676A (en) * | 2013-11-07 | 2014-06-04 | 北京中煤矿山工程有限公司 | High-pressure grout stopping device for L-shaped drill hole ground pre-grouting |
| CN104533452A (en) * | 2014-12-05 | 2015-04-22 | 中国矿业大学 | Sectional type grouting reinforcement method for underground coal mine fragmentized coal bodies |
| CN105041218A (en) * | 2015-08-18 | 2015-11-11 | 山东大学 | Collapse-prevention two-way rib wing jetting grouting drill bit and using method thereof |
| CN110017152A (en) * | 2019-03-23 | 2019-07-16 | 新汶矿业集团有限责任公司孙村煤矿 | A kind of underground engineering country rock substep grouting strengthening method smashed to pieces |
| CN110630292A (en) * | 2019-10-24 | 2019-12-31 | 河南理工大学 | Hole sealing and grouting reinforcement device and method for fractured coal rock mass |
| CN111472717A (en) * | 2020-04-24 | 2020-07-31 | 中煤科工集团重庆研究院有限公司 | Fixed-point reinforcing method for long borehole in coal mine |
| CN111894632A (en) * | 2020-08-03 | 2020-11-06 | 平顶山天安煤业股份有限公司 | Coal rock mass deep hole sectional grouting reinforcement device and reinforcement method |
| CN112780218A (en) * | 2021-02-02 | 2021-05-11 | 中煤科工集团西安研究院有限公司 | Long-drill-hole broken-zone multi-point operation grouting transformation system and method |
| CN112814615A (en) * | 2021-01-07 | 2021-05-18 | 淮南矿业(集团)有限责任公司 | Underground geological structure area forward drilling hole grouting sealing method |
| CN114961636A (en) * | 2022-06-21 | 2022-08-30 | 中煤科工集团重庆研究院有限公司 | Fixed-point grouting and sealing method for complex structural stratum of underground coal mine |
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| CN102852532B (en) * | 2012-10-09 | 2015-06-17 | 冀中能源股份有限公司东庞矿 | Grouting method for preventing rib walk caving |
| CN102852532A (en) * | 2012-10-09 | 2013-01-02 | 冀中能源股份有限公司东庞矿 | Grouting method for preventing rib walk caving |
| CN103293023A (en) * | 2013-06-18 | 2013-09-11 | 南京大学 | Original state sampling method for constructed fractured rock mass |
| CN103293023B (en) * | 2013-06-18 | 2015-07-08 | 南京大学 | Original state sampling method for constructed fractured rock mass |
| CN103835676A (en) * | 2013-11-07 | 2014-06-04 | 北京中煤矿山工程有限公司 | High-pressure grout stopping device for L-shaped drill hole ground pre-grouting |
| CN104533452A (en) * | 2014-12-05 | 2015-04-22 | 中国矿业大学 | Sectional type grouting reinforcement method for underground coal mine fragmentized coal bodies |
| CN105041218A (en) * | 2015-08-18 | 2015-11-11 | 山东大学 | Collapse-prevention two-way rib wing jetting grouting drill bit and using method thereof |
| CN110017152B (en) * | 2019-03-23 | 2021-08-31 | 新汶矿业集团有限责任公司孙村煤矿 | Underground engineering extremely-broken surrounding rock stepped grouting reinforcement method |
| CN110017152A (en) * | 2019-03-23 | 2019-07-16 | 新汶矿业集团有限责任公司孙村煤矿 | A kind of underground engineering country rock substep grouting strengthening method smashed to pieces |
| CN110630292A (en) * | 2019-10-24 | 2019-12-31 | 河南理工大学 | Hole sealing and grouting reinforcement device and method for fractured coal rock mass |
| CN111472717A (en) * | 2020-04-24 | 2020-07-31 | 中煤科工集团重庆研究院有限公司 | Fixed-point reinforcing method for long borehole in coal mine |
| CN111894632A (en) * | 2020-08-03 | 2020-11-06 | 平顶山天安煤业股份有限公司 | Coal rock mass deep hole sectional grouting reinforcement device and reinforcement method |
| CN112814615A (en) * | 2021-01-07 | 2021-05-18 | 淮南矿业(集团)有限责任公司 | Underground geological structure area forward drilling hole grouting sealing method |
| CN112780218A (en) * | 2021-02-02 | 2021-05-11 | 中煤科工集团西安研究院有限公司 | Long-drill-hole broken-zone multi-point operation grouting transformation system and method |
| CN114961636A (en) * | 2022-06-21 | 2022-08-30 | 中煤科工集团重庆研究院有限公司 | Fixed-point grouting and sealing method for complex structural stratum of underground coal mine |
| CN114961636B (en) * | 2022-06-21 | 2023-09-01 | 中煤科工集团重庆研究院有限公司 | Fixed-point grouting sealing method for underground complex-structure stratum of coal mine |
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